From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BD69E369990; Sat, 12 Sep 2026 08:13:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789200782; cv=none; b=c2O/pLrP4+zQYokcwiAe3QgfQNzTS189CUGlywNkJUBFtw8A878RzCLsIS47woGH5C/TcaB0EAgBZh0SPfoiOyDRHB4k1bYmJ8R9Wj2I+cPR+Rlst2lrtBYtC645IFxtATYME0W3QW1kH06HyDdh5NzWhmTYfQlYps+YVAfKG/c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789200782; c=relaxed/simple; bh=GfghNlrXKztx8A4dtIFgPAdJ3NMyL/XzOy10smg8WwA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=io6Gf8BiOMKjcmsgtWFVEKnCqTwFWDYdKYSxE7S06Nxm8E/4ZVo6TTBTOYaRWrVaC/CDawHG7yzxKtKnlbYqD2yAjfezUx3WUpdwA2wZEZISTUe9DPujqlTNuGarW3HqhvmgQ1WkWb/pSQJzJgzpWbX0TwJK3i4Duaa2DpDDW3A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=bCCScjay; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="bCCScjay" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5BEFF1F000FF; Sat, 12 Sep 2026 08:13:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789200781; bh=OSUR56Fe9N/G/WBMO1ncTB2k2FIwGuWW8r+pFdGJCHg=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=bCCScjay+X6O4zARDTGO/qrBRSvRFzkUzuT6FkOcvzQfOKw7rBrK3upNPEUYUZV1w 8m46cx2utbcPIbcJeGU0tZS3LEkE3TdBFg9IQG1dIWx9m8KI4ZQ9zpWjj1KF29y+4C hoVmo4Ds6+/Y9qdif/vY57rWBg9XYOQoFsd4cUcU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Devin Wittmayer , Felix Fietkau , Sasha Levin Subject: [PATCH 7.2 0859/1815] wifi: mt76: mt76x02: do not WARN on invalid rx descriptor length Date: Sat, 12 Sep 2026 08:43:29 +0200 Message-ID: <20260912065709.091602554@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065648.999753832@linuxfoundation.org> References: <20260912065648.999753832@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 7.2-stable review patch. If anyone has any objections, please let me know. ------------------ From: Devin Wittmayer [ Upstream commit 81497634d9f872fd3e8b03aada55574afff6f174 ] The MPDU length in the rx descriptor comes from the hardware. In monitor mode with the fcsfail filter enabled, the hardware passes up corrupted frames, and a corrupted frame can report a length larger than the received buffer. The bounds check correctly discards such frames, but its WARN_ON_ONCE wrapper means any over-the-air garbage frame taints the kernel, and panics it on the first such frame when panic_on_warn is set. Drop the WARN and discard the frame silently, matching what commit c2d4c8723dbf ("mt76x2: remove some harmless WARN_ONs in tx status and rx path") did for the neighboring rx and tx status paths. Observed immediately on rx with an MT7612U in fcsfail monitor mode on a busy channel. Fixes: 7bc04215a66b ("mt76: add driver code for MT76x2e") Signed-off-by: Devin Wittmayer Link: https://patch.msgid.link/20260613002544.27750-2-lucid_duck@justthetip.ca Signed-off-by: Felix Fietkau Signed-off-by: Sasha Levin --- drivers/net/wireless/mediatek/mt76/mt76x02_mac.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_mac.c b/drivers/net/wireless/mediatek/mt76/mt76x02_mac.c index 14ee5b3b94d31..aa525adb6743c 100644 --- a/drivers/net/wireless/mediatek/mt76/mt76x02_mac.c +++ b/drivers/net/wireless/mediatek/mt76/mt76x02_mac.c @@ -848,7 +848,7 @@ int mt76x02_mac_process_rx(struct mt76x02_dev *dev, struct sk_buff *skb, } } - if (WARN_ON_ONCE(len > skb->len)) + if (len > skb->len) return -EINVAL; if (pskb_trim(skb, len)) -- 2.53.0